The graphs given apply to a convex lens of focal length f, producing a real image at a distance v from the optical centre when a self-luminous object is at distance u from the optical centre. The magnitude of magnification is m. Identify the following graphs with the first named quantity being plotted along y-axis.

Column–I	Column–II
I.         v against u	A.
II.      $\frac{1}{v}$   against $\frac{1}{u}$	B.
III.      m against v	C.
IV.      (m + 1) against $\frac{v}{f}$	D.